I'm trying to figure out the best, least intrusive way of sound proofing the walls of a bathroom. The bathroom shares a wall with my bedroom, and my 3 yea old's bedroom. The main problem is the sound of water running (plus every bump on the counter and everything) echos loud and clear through the wall into my sons room. I found sound deadening drywall and it seems like a good choice. Another option is adding another layer fo drywall with something like Green Glue between them. But all the walls and ceilings in the house are textured. So replacing just one or two walls in a room is just not possible.
This is the layout of the two rooms. I've added red box around the wall with the most noise.
Is there anything else I'm missing here that I could do to dampen the noise short of tearing the bathroom apart?